Without concern for ones own advantage; selfless or self-sacrificing(adjective)
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Use "self-denying" in a sentence
"They were Americans, descended out of the English, and yet the refraining and self-denying of the English spirit-groping were not theirs."
"It is perhaps little wonder that Savonarola remains such a fascinating figure, capable of being portrayed as the acme of either self-denying sanctity or philistine heresy."
"It isn't something I can reconcile in the future with a regeneration, because it means the Doctor is basically self-denying, therefore, he is NOT a character I admire."